Question: What is the royal title of Louis the Pious and who followed his reign.
Paraphrase: What's the royal title of Louis the Pious and who succeeded him?
SPARQL (Wikidata): SELECT ?value1 ?obj WHERE { wd:Q43974 p:P97 ?s . ?s ps:P97 ?obj . ?s pq:P156 ?value1 . }